Clint at BHP seems to do quite a few Ford on Link ecu's and they have some reasonably priced offerings.
Or there is the obvious choices of DTA, Emerald too which would have good support.
Bailey Performance seem to be a Megasquirt place if you want to go down that road.
But ask around about the abilities of any "tuner", get reviews from customers etc as the word "tuner" seems to cover a vast range...many complete morons to a select few who are actually any good.